A Queens teen got a brutal beatdown by a group of NYPD police officers during a stop outside the Flushing YMCA, dramatic video released today shows.

The Jan. 8 attack — which was captured on a witness’ cell phone — begins about 12:38 p.m. with two cops fighting to restrain Queens resident Robert Jackson, 19, on the ground while yelling “put your hands behind your head.”

“I can’t, I can’t, please stop,” Jackson pleads, crying, as the number of cops kicking and punching — and at one point scraping his face against the asphalt — increases to seven officers.